What is the right place to start reading about Vedas/Upanishads/Puranas for a complete newbie in the field?

Which came first Puranas or Vedas? Some say, Vedas came in 5000 BC and then Puranas came after that. Is there any proof for that?

Please tell me if those questions are the same.
Choose your answer from: (i) no (ii) yes
(i)